Tonometer



FIG. 1 is a front view of a tonometer showing an embodiment of our new design;

FIG. 2 is a right side view of the embodiment;

FIG. 3 is a left side view of the embodiment;

FIG. 4 is a rear view of the embodiment;

FIG. 5 is a top view of the embodiment; and,

FIG. 6 is a bottom view of the embodiment. 

The ornamental design for a tonometer, as shown and described. 